Oh, dieser Vater

At a rundown school, the "Ultimate Teacher" Ganpachi is sent to whip things into shape and prepare the delinquent students for the real world. But the students aren’t about to let Ganpachi ruin the gang they’ve built, so their leader, Hinako, fights back-with the help of her secret weapon: her lucky kitty underwear. Things take a wilder turn when it’s revealed that Ganpachi is the product of genetic experiments.